Abstract
Hisingerite occurs as a weathering product of iron-rich saponite in rhyolitic tuff of Oya, Tochigi Prefecture. The chemical composition: SiO2, 40·68%; Al2O3, 4·44%; Fe2O3, 28·54%; MgO, 1·85%; CaO, 1·42%; Na2O, 1·50%; K2O, 0·33%; H2O+, 6·43%; H2O−, 13·70%; total 98·89%. Very broad and weak X-ray powder reflections occur at 16, 4·5, 2·5, 1·7 and 1·5 Å, which correspond to the main peaks of nontronite. It is considered that trioctahedral iron-rich saponite was altered to hisingerite, a very poorly crystalline form of nontronite, by oxidation of iron and advanced leaching of octahedral Mg ions.
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Kohyama, N., Sudo, T. Hisingerite Occurring as a Weathering Product of Iron-Rich Saponite. Clays Clay Miner. 23, 215–218 (1975). https://doi.org/10.1346/CCMN.1975.0230309
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DOI: https://doi.org/10.1346/CCMN.1975.0230309